can not resolve nameservices when using meta service api--create_instance

[pklcoder]

in my case,we create instance and create cluster with Compute-Storage Decoupled.
use meta service api--create_instance to create instance,the code like below:
curl 'ms:5000/MetaService/http/create_instance?token=greedisgood9999' -d '
{
"instance_id": "lycc_test4_decouple",
"name": "lycc_test4_decouple_instance_name",
"user_id": "lycc_test4_decouple_user_id",
"vault": {
"hdfs_info" : {
"build_conf": {
"fs_name": "hdfs://nameservice:8020",
"nameservices": "nameservice",
"nn": "nn1,nn2",
"rpc2": "hostnamen2:8020",
"rpc1": "hostnamenn1:8020",
"provider": "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider",
"user": "hive",
"hdfs_kerberos_keytab": "/home/q/keytab/hive.service.keytab",
"hdfs_kerberos_principal": "hive/hostname@LYCC.COM",
"hdfs_confs" : [
{
"key": "hadoop.security.authentication",
"value": "kerberos"
}
]
},
"prefix": "/test4_vault"
}
}
}'
but found errors in doris-be server log like this:
hdfsBuilderConnect(forceNewInstance=1, nn=hdfs://nameservice:8020, port=0, kerbTicketCachePath=(NULL), userName=(NULL)) error:
UnknownHostException: nameservice java.lang.IllegalArgumentException: java.net.UnknownHostException: nameservice
at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:475)
at org.apache.hadoop.hdfs.NameNodeProxiesClient.createProxyWithClientProtocol(NameNodeProxiesClient.java:134)

may be these ha parameters of hadoop in wrong stytle:
"nameservices": "nameservice",
"nn": "nn1,nn2",
"rpc2": "hostnamen2:8020",
"rpc1": "hostnamenn1:8020",
"provider":
"org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"

I have no idea how to send these ha parameters of hadoop,any one can point out the right way，thanks.